Windows Knowledge Base

[Hardware Ref] BIOS Beep Codes

I use these codes to trouble shoot hardware issues for years. Hope that will be useful to you.

When a computer is first turned on, or rebooted, its BIOS performs a power-on self test (POST) to test the system's hardware, checking to make sure that all of the system's hardware components are working properly. Under normal circumstances, the POST will display an error message; however, if the BIOS detects an error before it can access the video card, or if there is a problem with the video card, it will produce a series of beeps, and the pattern of the beeps indicates what kind of problem the BIOS has detected.
Because there are many brands of BIOS, there are no standard beep codes for every BIOS.

The two most-used brands are AMI (American Megatrends International) and Phoenix.

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[DMX]Symmetrix SYMRDF command Explained

We've explained in "How to set up dynamic RDF pairs using SYMCLI?" the procedures of setting dynamic RDF pair. Here we will explain in detail how to read the SYMRDF output.
You can identify the devices on your local symmetrix to determine which are source devices and which are remote target devices.  It will also show the role, whether it's R1 or R2 type of device, more important it will display RDF states including source/target device state(RW/WD or NR), R1/R2 Invalid tracks and RDF link status.
Please see below sample output.

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